lazell



PATENTED SEPT..15, 1868.

E. E. LAZELL.

GENTERING DEVICE.

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EDWIN E. LAzELL,-oE PHILADELPHIA, PENNsYLvA r AssIeNoE T0 HIM- sELE, THEODORE H. PETERS, AND EEANeIs KEvsE oE SAME PLACE,

Letters Patent No. 82,131, dated'iSeptember 15, 1,868.

IMPROVED GENTRING-DEVIGB.

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Be it known that I, EDWIN E. LAzELL, of the city and county of Philadelphia, and'State of Pennsylvania,

have invented a new and useful Improvement in Oentring -Tools; and I-dohereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, which is made a part of this. specification. v

My invention relates to a device for finding the true centre of a cylindrical piece of metal wood, or other material, of which the centre is required for any purpose. a p

.It consists of a. hollow conical head, provided at its apex with a tubular stem, by which to hold it while in operation, and through which passes the centre-punch, which is of any approved form. The head is provided internallywith longitudinal angular ribs, which, by the rotation of the piece to be centred, serve to remove from its surface any fins or other irregularities, and also. to guide said piece to a central position inthe head,

'when, by a stroke on the head of the punch, the centre may be correctly marked.-

In the drawings- 4 p Figure l'is a sectional elevation of my improved centring-tool in position in the tail-stock of a turning-lathe,

Figure 2 is a front elevation of the tool, detached. v i

A may represent the head-stock amid the tail-stock of an ordinary turning-lathe, and G the materialto he centred. Y I

D is the conical head and E the punch of the centring-tool. D represents the conicalrecess in the face of the head D, a'nd d the converging angular ribs of which the surface of said recessis'composed. d is the tubular stein, by which the head is attached, here shown as inserted in the aperture in the tail-stool: provided for the fcentre, and held by the set-screw B. 'The punch E is formed with a head, e, and a, point, e, of any suitable form. I i i i The head D and punch may both be made of steel or other suitable metal, and the external form of said head and the shape of said punch may be varied, as preferred. The tool may also be employed otherwise than in a lathe, (as. shown,) and, when employed in a lathe, may he mounted on the rest or'anyother convenient part.

Having thus described all that is necessary to a clear u ndersta nding of my invention, I would state that I am aware of themilling and'centring-device patented by S. Wing, August 1, 1865, and do not thereforeclaimv the combination of a conical concave milling-head with a eentring-pin; but

What I do claim as new, and of my invention, isl The arrangement, wit! the concave conical milling-head D, of the centring-pin E, projecting through-the head D, in the manner and for ..re purpose herein specified.

EDWIN E. LAZELL. Witnesses;

CARL Booxnvo, JULIES Gncr. 

